by Cecilin Fenoglio-Preiser [and others]
Mosby, 1990
Buku Teks
Owen, George E., author
Harper and Row, 1967
Buku Teks
Chamberlin, Marry W., author
American Library Association, 1959
Buku Referensi
Borland International, 1988
Buku Referensi
editors, Richard C. Johnson, Henry Jasik
McGraw-Hill, 1987
Buku Referensi